The economic impact of Ontario's minimum-wage hike on the province's lowest earners has received a great deal of attention, but the effect is felt more broadly by employers who face labour cost increases.

The hikes also likely spread beyond those earning a minimum wage; an increase in the minimum wage ripples through the wage distribution and potentially leads to higher incomes for other workers.

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Many workers who earned close to the minimum wage prior to the increase likely also saw higher paycheques. Their remuneration needs to go beyond the new minimum wage to reflect their experience and ability. Otherwise, non-experienced minimum-wage employees and more experienced or higher-skilled workers receive the same pay, skewing incentives in the workplace.

Similarly, employers may raise all wages to maintain a relative hierarchy of wages according to employee skill levels. This broader wage adjustment may be necessary for businesses to remain competitive in the labour market and reduce turnover.

In these scenarios, business owners may substitute low-skilled employees with high-skilled workers because of an increase in the relative price of low-skilled labour. As such, raising the minimum wage could also increase the demand for skilled labour and, consequently, their wages.

How far does this ripple effect spread across the wage spectrum and how wide is its impact?

A Canadian study shows that raising the minimum wage significantly affects wages up to the 15th percentile of the wage-distribution ladder, that is, of the wages of the lowest 15 per cent of earners. The further wages of workers are from the minimum wage, the more the effect of any increase in minimum wage is mitigated.

As such, a minimum-wage increase has the potential to reduce income inequality, as more workers at the bottom of wage distribution earn wages close to middle-class wages. However, depending on its size, an increase in the minimum wage can have sharply different outcomes on the distribution of overall earnings.

In a C.D. Howe Institute study, Professor Joseph Marchand of the University of Alberta argued the poverty impact of a minimum-wage hike depends on whether minimum-wage workers kept the nature and working hours of their employment unchanged. It is best, as a result, to introduce such hikes when the economy is strong.

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A study that looked at the effect of minimum-wage increases on wage inequality across Organization for Economic Co-operation and Development-member countries also shows the minimum-wage hike actually begins to increase income inequality beyond a certain "maximum-effectiveness" level. After reaching this level, additional wage increases are too high, insofar as they can be accompanied by significant job losses and actually increasing inequalities as a result.

Furthermore, a higher minimum wage results in higher labour costs that are eventually passed onto customers, causing inflationary pressures. Thus, while raising the minimum wage seems to have no initial ripple effect on wages at the middle or top of the wage distribution, the impact on inflation eventually results in higher wages across the wage ladder.

The January weakness in Ontario's labour market will no doubt spur a debate on whether the province has exceeded the threshold at which higher minimum wages actually exacerbate, rather than reduce, inequalities. It would be wise to consider giving the labour market more time to adjust to the recent increase before rushing forward with the plan for a second increase, to $15 an hour, next January.

With Toronto in a bid to host Amazon’s planned HQ2 headquarters, Justin Trudeau said he planned to tell CEO Jeff Bezos why he should continue to invest in Canada. The Prime Minister spoke Thursday ahead of a meeting with Bezos in San Francisco.The Canadian Press

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